PRO-1512 Conditional fields inconsistencies

Describe the bug

1. A conditional field can not be required. If it is required, page/piece can not be saved. It makes sense both UI and API to ignore completely a conditional field which is not meeting a condition. If this is the behavior by design, please ignore this.
2. If conditional field is prefilled it is not nullified when it doesn’t meet the condition. Its value is still sent by the UI to the API. I could agree it’s a developer reposibility to nullify the value in post create/update event handler, but there should be a clear instructions about that. So again, is it the desired behavior?
3. Related somewhat to 2., if there is a default value for a conditional field, it is saved to the DB no matter the condition for this field is not met.

To Reproduce

fields: {
  add: {
    category: {
      type: 'select',
      label: 'Type',
      choices: [
        {
          label: 'Cat 1',
          value: 'cat1'
        },
        {
          label: 'Cat 2',
          value: 'cat2'
        }
      ],
      required: true
    },
    conditional: {
      type: 'string',
      label: 'Conditional field',
      if: {
        category: 'cat1'
      },
      required: true
    }
  }
}

For 1. try to submit while selecting Cat 2 For 2. set the required: false flag, choose Cat 1, fill the Conditional field, choose Cat 2 and submit. You should see the value you’ve filled is saved to the database For 3. add def: 'Default' to conditional and def: 'cat2' to category field scheme, create new piece item without changing any fields. Value Default is saved to the DB for field conditional.

[abea]

It looks like there was a misunderstanding here. I think @myovchev was saying that currently a required conditional field will throw an error even when it is hidden. I’m finding that as well. That should not happen. I think we should also reconsider the other points. I’m not finding documentation of the decision on that point.

I’m reopening to address the first point at least.

[abea]

closed by #3437